*{
    margin: 0;
    padding: 0;
}
#tu{
    width: 350px;
    height: 550px;
    margin: 50px auto;
    padding: 10px;
    background-color: blue;
    text-align: center;
}
#box1{
    width: 200px;
    height: 200px;
    background-color: red;
    padding: 10px;
    border: 10px solid yellow;
}